WO1996028306A1 - Systeme et procede de separation d'un support d'image contenant un stratifie - Google Patents

Systeme et procede de separation d'un support d'image contenant un stratifie Download PDF

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Publication number
WO1996028306A1
WO1996028306A1 PCT/US1996/002570 US9602570W WO9628306A1 WO 1996028306 A1 WO1996028306 A1 WO 1996028306A1 US 9602570 W US9602570 W US 9602570W WO 9628306 A1 WO9628306 A1 WO 9628306A1
Authority
WO
WIPO (PCT)
Prior art keywords
image bearing
layer
temperature
medium
assembly
Prior art date
Application number
PCT/US1996/002570
Other languages
English (en)
Inventor
James F. Ryan
Alfredo G. Kniazzeh
Original Assignee
Polaroid Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Polaroid Corporation filed Critical Polaroid Corporation
Priority to DE69614098T priority Critical patent/DE69614098D1/de
Priority to EP96910331A priority patent/EP0814962B1/fr
Priority to JP8527634A priority patent/JPH11502478A/ja
Priority to AU53556/96A priority patent/AU708991B2/en
Publication of WO1996028306A1 publication Critical patent/WO1996028306A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B43/00—Operations specially adapted for layered products and not otherwise provided for, e.g. repairing; Apparatus therefor
    • B32B43/006—Delaminating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
    • B29C63/0004—Component parts, details or accessories; Auxiliary operations
    • B29C63/0013—Removing old coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/0027—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using protective coatings or layers by lamination or by fusion of the coatings or layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/11—Methods of delaminating, per se; i.e., separating at bonding face
    • Y10T156/1153—Temperature change for delamination [e.g., heating during delaminating, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/19—Delaminating means
    • Y10T156/1911—Heating or cooling delaminating means [e.g., melting means, freezing means, etc.]

Definitions

  • the present invention relates to systems and methods for delaminating laminates, and more particularly, to systems and methods for delaminating protective overcoating layers on an image bearing medium in a manner which minimizes the formation of artifacts in the image bearing medium.
  • a recent development in the image forming arts employs the use of thermal imaging laminates for achieving high quality, high resolution images, such as for radiological images useful in the medical arts. Examples of such media are described in commonly- assigned International Patent Application No. PCT/US 87/03249 published June 16, 1988, under International Publication No. WO 88/04327; and U.S.Patent No. 5,200,297. More particularly, the noted International Patent Application describes a thermal imaging medium and a process for forming an image.
  • the medium is a laminate in which an image forming layer thereof is a porous or particulate imaging material, preferably, a layer of carbon black that is deposited on a heat- activatable image-forming surface of a first sheet-like element.
  • the image forming layer has an adhesive strength to a first sheet-like element of the laminate that is a function of its exposed state.
  • the first sheet-like element carrying the imaging material is covered with a second sheet-like element that is laminated to the first so that the imaging material is confined between the first and second sheets.
  • This medium can be imagewise exposed as by laser scanning, whereby exposed portions of the imaging material are firmly attached to the first sheet, and unexposed portions of the imaging material are firmly attached to the second sheet.
  • first image surface which comprises exposed portions of an image-forming substance that is more firmly attached to the first sheet and a complementary second image surface which comprises non-exposed portions of the image- forming substance carried or transferred thereto.
  • the sheets are then peeled or delaminated with the first sheet carrying exposed imaging material portions, and the second element carrying unexposed portions.
  • a pair of complementary or binary image layers is obtained, either one of which may for reasons of informational content be considered the principal image area.
  • Such image forming materials and processes are capable of producing extremely high quality and high resolution images. However, there are possibilities for damaging the image layer by physical contact, physical elements or the like. Therefore, it is desirable to protect the image forming layer.
  • a protective overcoating material e.g. a thin, transparent, but durable layer
  • a protective overcoating material e.g. a thin, transparent, but durable layer
  • Lamination of protective overcoats have been accomplished by using a continuous roll, i.e. carrier web, to transfer the durable protective layer to the image carrying sheets. Activation energy is necessary for fusing the durable layer to the imaged sheet at a nip formed by and between a pair of compression rollers.
  • pinholes are considered to be disruptions in the image forming or bearing layer which permit the undesired passage of light therethrough.
  • pinholes can vary in size from about 10 to 300 microns.
  • some of the image bearing particles can be physically removed because of being adhered to the release layer of the overcoating material on the carrier web.
  • pinholes are not necessarily large, their presence can otherwise diminish achievement of the high resolution achievable by the foregoing type of imaging media. As a result of such pinholes of this removal type, the final imaged product may not be commercially acceptable. Accordingly, there is a continuing desire for improving upon known efforts to enhance the protection of the image layer while reducing the formation of undesirable pinholes which might adversely affect image quality.
  • provision is made for improving upon known methods and systems for reducing pinhole formation in image bearing material on an image carrying medium.
  • a delamination assembly is utilized as well as means for advancing the web in a first direction against the delamination assembly as well as for advancing the medium in a direction different from the first direction.
  • Provision is made for controlling the temperature of the delaminating assembly for reducing the formation of pinholes in the image bearing layer upon release of the overcoating material during delamination.
  • a system for controlling the temperature so as to be in a range effective for reducing the pinhole formation while minimizing physical distortions to the image bearing medium.
  • the means for controlling the temperature comprises at least a surface on the delaminating member having a thermal heat transfer of coefficient which is effective for controlling heat exchange so as to maintain the temperature within the range.
  • the means for controlling temperature comprises means for directing air passed the delamination assembly for controlling its temperature.
  • the temperature controlling means includes a heating element for actively heating the delaminating assembly.
  • a method of delaminating a carrier web laminate carrying an image protective overcoating material after the overcoating material has been laminated onto image-bearing material on a sheet by the application of heat and pressure comprises the steps of: bending the carrier web against a delaminating assembly, advancing the carrier web in a first direction; advancing the image carrying sheet in a direction different from the first direction, and controlling the temperature of the carrier web and the sheet at a point delamination adjacent the delaminating assembly for minimizing the formation of pinholes in the image bearing layer.
  • a method of controlling the temperature to within the predetermined range is provided.
  • Figure 1 is a diagrammatic cross-sectional side elevational view of a web and an image carrying medium prior to lamination;
  • Figure 2 is a diagrammatic cross-sectional side elevational view of the web and the image carrying medium of Figure 1 during lamination;
  • Figure 3 is a diagrammatic cross-sectional side elevational view of a protective overcoat bonded to an image carrying medium in the process of delamination;
  • Figure 4 is a diagrammatic side view of a laminating and delaminating system according to a preferred embodiment of the invention shown in one mode of operation;
  • Figure 5 is a diagrammatic side view of another embodiment of the system similar to Figure 4 in which there are shown a blower and heating element for controlling temperature of a delaminating bar.
  • a laminating sheet 10 comprising a carrier web 11 and in juxtaposed relationship thereto a protective overcoating material 12 adapted to be laminated onto an image forming or bearing layer 14 carried on a substrate 15 of an image bearing sheet or medium 16 for purposes of protecting the latter.
  • the web 11 and its integral protective coating material 12 form a laminating sheet which can be like that described in the last noted patent applications.
  • the web 11 forms a support layer for the overcoating materials 12 which overcoating materials comprise an exterior adhesive layer 18, a barrier layer 19, an intermediate durable layer 20, and a release layer 22.
  • the protective overcoat i.e.
  • a thermal transfer overcoat is thermally bonded to the image bearing medium 16 including the image bearing layer 14 in a laminating process to be described.
  • the release layer would be completely removed from the durable layer following lamination.
  • the release layer does not cleanly separate from the durable layer, so that upon delamination of the carrier web some of the porous particles forming the image forming layer 14 are unnecessarily removed therewith. Accordingly, undesirable pinholes or openings can be formed in the image forming layer, thereby permitting light to pass therethrough. These pinholes, although not shown, usually range in shape and size from about 10 to about 300 microns.
  • Fig. 1 illustrates the laminating sheet 10 disposed in juxtaposed relationship over the image carrying medium 16.
  • the image carrying or bearing medium referred to as a keeper includes an image bearing layer 14 which is made of, for example, carbon particles formed on a transparent substrate layer 15 made of, for example, polyester.
  • the image forming medium 16 has had another polyester layer (not shown) and complementary layer (not shown) of carbon particles removed therefrom, the removed particles are referred to as a throwaway layer.
  • the thicknesses of the keeper or image forming medium 16 and the noted throwaway layer can be about 0.5 to 10 mil, and 0.5 to 7 mil; respectively.
  • the laminating sheet 10 which in this embodiment is in the form of a continuous web having a width generally wider than the image bearing or carrying medium 16 for ensuring complete lamination coverage of the image carrying surface.
  • the web 11 can be formed of any material, such as a filled polyester film base, which supports the thermal transfer overcoating material. Some characteristics of the web 11 are that it has no subcoats.
  • the web widths can vary from about 22 inches to 63 inches with roll lengths being 20,000 to 40,000 linear feet. Of course, other dimensions for the laminating sheet can be employed given the particular medium being laminated. Film roughness can be approximately 0.2 ⁇ RMS. Unrestrained heat shrinkage values are about 4% in both the machine and transverse directions when measured at 150°C for 30 min.
  • the thickness can be about 0.92 mil, but other thickness dimensions can be used consistent with the principles of the present invention.
  • the web 11 may be formed from any material, besides the noted polyester material, so long as it can withstand the conditions which are required to laminate the protective overcoat material 12 to the image carrying medium 16. If desired, the web 11 may be treated with a subcoat or other surface treatment, as well-known, to those skilled in the coating art, to control its surface characteristics, for example, increase or decrease the adhesion of the durable layer 20 to the web 24 by means of the release layer 22.
  • the web 11 should be sufficiently coherent and adherent to the durable layer 20 to permit displacement of both the web 11 and part of the release layer 22, away from the protected laminated image carrying medium including removal of those portions of the laminating sheet 10 which extend beyond the periphery of the medium 16. /28306 PCMJS96/02570
  • the durable layer 20 may be formed from any material (such as a cured acrylic polymer or a polymethacrylate) which confers the desired properties for protecting the image.
  • aforenoted International Patent Application No. PCT/US91/08345 describes an embodiment wherein the durable layer 20 is coated as a discontinuous layer from a latex which clears during lamination to produce a clear durable layer.
  • the durable layer is comprised 80% by weight acrylic polymer, 10% by weight polyethylene/paraffin wax, and 10% by weight aqueous-based polyamide binder, and was prepared by mixing the polymer and wax lattices, adding the binder, then adding a silicone surfactant.
  • the overcoating material 12 when laminated over the binary image bearing layer, not have a thickness greater than about 30 micrometers, since thicker overcoating layers may, in some cases, cause problems in viewing the image due to optical effects within the overcoating material 12.
  • the thickness of the durable layer 20 does not exceed 10 micrometers, and, more desirably, this thickness is in the range of 3 to 6 micrometers.
  • the durable layer 10 should of course be abrasive and chemically resistant to materials with which it is likely to come into contact, including the materials which may be used to clean the protected laminated image carrying medium.
  • the material for the durable layer 20 should be resistant to and substantially unchanged by any materials with which it may come into contact, such as water, isopropanol and petroleum distillates.
  • the protection of the image carrying medium 16 conferred by the protective overcoat is improved with increased lubricity. Therefore, at least one of a wax, a solid silicone and silicone surfactant is, preferably, included in the durable layer 20 to increase the lubricity of this layer. Also, the release layer 22 can be composed of a material having high lubricity.
  • the release layer 22 may break unevenly so that part of the release layer having a discontinuous thickness remains with a discard or throwaway layer or sheet 36 and another part of the release layer 22 remains attached to the durable layer 20 on the keeper substrate sheet or medium 16.
  • pinholes in the image forming layer which are referred to as the removal type, are caused when particulate pieces or chunks (not shown) of the carbon of the image forming layer 14 tend to adhere to and go with the part of the release layer 22 remaining with the throwaway layer 36; see Fig. 3. It will be seen that the throwaway layer 36 will include the entire laminating sheet when it is not laminated to the image bearing medium 16.
  • the adhesive layer 18 of the coating material 12 it is disposed on the surface of the durable layer 20 remote from the web 11. During lamination, the durable layer is adhered to the image layer 14 by means of the adhesive layer 18.
  • the use of an adhesive layer 18 is desirable to achieve strong adhesion between the durable layer 20 and the image carrying medium 16.
  • Various types of adhesive may be used to form the adhesive layer 18.
  • the adhesive layer 18 might be formed from a thermoplastic adhesive having a glass transition temperature in the range of about 185°F, in which case bondability is effected by the conductive heating of the adhesive layer above its glass transition temperature.
  • An example of a suitable adhesive layer 18 is designated X95-180.
  • the barrier layer 19 is preferred to be an aqueous barrier coating which performs solvent resistance functions. It can be a PVDC material, such as Daran 158.
  • a laminating sheet 10 which comprises the above laminar constructions is available from Polaroid Corporation, Cambridge, Massachusetts, USA.
  • the laminating sheet 10 is juxtaposed to the image carrying medium 16 and both are fed together at a suitable rate, such as about .5 inches per second to a laminating unit.
  • Both the sheet 10 and the image bearing medium 16 travel through a compression nip 28 formed between a heated roller assembly 30 which is about 3.5 inches in diameter and is actively heated by a heating device (not shown) , and a cold roller assembly 32 which is also approximately 3.5 inches in diameter, and is actively cooled by a cooling device (not shown) .
  • the sheet 10 and the medium 16 can be prewrapped onto an angular portion of the cold roller assembly 32.
  • a variety of heating devices can be used to heat the heated roller assembly 30.
  • the heating device can take the form of an interior resistance cartridge controlled by an external thermistor spaced near the top surface of the hot roller.
  • the heated roller assembly 30 is preferably maintained at a temperature of about 320 ⁇ 5°F and the cold roller assembly 32 is, preferably, maintained at a temperature of about 90°F or less in order to minimize ripple and curl in the protected laminated image carrying medium 34; as described in greater detail in the last noted applications.
  • Both the hot roller assembly 30 and the cold roller assembly 32 should be constructed from conductive materials, such as aluminum, and at least one of the rollers should have a compliant elastomeric layer to evenly distribute a nip loading of about 800 lb.
  • any commercially available cooling unit can be used to actively cool the temperatures which are desired.
  • the cold roller assembly 32 can be cooled either internally, such as by circulating cool air or a liquid coolant through the interior of the roller, or externally, such as by fanning cooled air over the cold roller surface.
  • the structure of the cold roller assembly 32 can be designed to maximize the cooling effect of the cooling unit. For instance, a cold roller cooled by air flow could be designed as a hollow roller with internal fins.
  • a bonded image carrying medium 34 is formed due to the adhesive layer 18 softening, molding to, and adhering to the image carrying medium under a compressive force for a time sufficient to promote adhesion of it and the barrier layer, the durable layer and portions of the release layer.
  • the bonded sheet and image carrying medium 16 designated jointly as the bonded image carrying medium 34, are postwrapped along the cold roller assembly 32 for an arcuate distance defined by the angle ⁇ l, where ⁇ l is ideally about 20 degrees.
  • this angle can vary for the reasons noted in the above noted application for eliminating some types of laminating artifacts, such as longitudinal curl and ripples, in the protected laminated image carrying medium 34.
  • the purposes for postwrapping the laminated or bonded image carrying 34 are noted in the last noted application.
  • the first is to counter a curl tendency when the sheet 10 is prewrapped along the hot roller assembly 30; the second is extracting heat from the bonded image carrying medium 34 along the cold roller assembly 32 for eliminating ripples in the protective overcoat; a third is to prevent thermal expansion from buckling the sheet 10 and thereby imparting ripples thereto; and, the fourth is to maintain a bond between the sheet 10 and the cold roller assembly 32 during a time in which the web temperature is high enough to otherwise distort the web dimensions, compromising registration quality.
  • the degree of postwrap angles at which the sheet and the medium 16 contact the lower cold roller do not form part of the present invention and will not be discussed herein in further detail.
  • the sheet 10 and the image bearing medium 16 are prewrapped for the reasons noted in said application and the prewrap angles can also vary. However, reference is made to the noted copending patent application for a more detailed description thereof.
  • curl it is defined as any curvature of the protected laminated image carrying medium 34 away from the plane of its major surface area. Curl can occur in either the longitudinal direction which is the direction of feeding of the sheets, or in the transverse direction which is perpendicular to the longitudinal direction. Rippling which generally occurs in the transverse direction, i.e. the direction perpendicular to the feed direction of the web is defined as oscillating elevations of the protected laminated image carrying medium above or below the plane of the major surface area of the protected laminated image carrying medium.
  • the throwaway layer 36 After postwrapping the bonded web and image carrying medium 34 throughout the arcuate distance of ⁇ l, the throwaway layer 36, consisting of the web 11 and a part of the release layer 22, is separated from the protected laminated image carrying medium 34 by a delaminating assembly which in the preferred embodiment is in the form of an elongate delaminating bar 50 extending generally parallel to the laminating roller assemblies.
  • the throwaway layer 36 is wound onto take-up roller 52 (as shown in Figure 4) with the assistance of the tension supplied by a pair of pull rolls 53.
  • the throwaway layer 36 is brought against a delaminating surface 54 defined by the outside surface of the bar 50 with sufficient tension so as to effect separation or delamination of the throwaway layer 36 from the laminated image carrying medium 34.
  • the protected laminated image carrying medium 34 includes the image bearing substrate 15, the image forming layer 14, the adhesive layer 18, the durable layer 20, and part of the release layer 22.
  • the image bearing medium 34 is pulled under constant tension in a direction different from the throwaway layer by a pair of eject rolls 55.
  • the sheet 10 can have a variety of widths and can be a continuous 32 inch wide member which spans between an idle supply roller 56 and a driven take-up roller 52.
  • the width of the web 10 is set to ensure its registration with the width of the image carrying medium 16.
  • the image carrying medium 16 can vary in widths which vary from about eight inches to about 30 inches.
  • the heated temperature of the delaminating bar be controlled to be within a predetermined range which has been effective to reduce pinhole formations.
  • the type of pinholes reduced are those of the removal type which are formed by the removal of carbon particles from the image forming layer 14 during delamination of the carrier web 11 and the release layer 22 from the laminated medium 34.
  • the significant reduction of the size of the pinholes is due to the fact that the controlled heated temperature affects the release forces of the release layer 22, such that they are more uniform and thus, the adherence forces on the carbon by the adhesives on the medium 16 are overcome. As a result, the carbon is not readily pulled away with the throwaway layer 36.
  • the temperature range which is preferred in connection with effecting the pinhole size reduction for the materials above can be in a range of about 90°F to about 160°F. with about 125°F. being preferred. If the temperatures are too high there might be a problem with fringing.
  • the delaminating bar 50 can be an elongated and hollow piece of anodized aluminum which extends generally parallel to the roller assemblies. It has been determined that such an aluminum bar has a thermal heat transfer coefficient which is effective for 5 controlling heat exchange of the medium and layer 34 and 36; respectively so as to maintain the temperature within the noted temperature range. Of course, other materials besides aluminum can be used.
  • the delaminating bar 50 can have its temperature controlled so as to be actively heated by an electrical heating element 60 which is disposed therein. Temperature sensors, not shown, can regulate the temperature provided by the heating element so that the delaminating bar 50 remains in the desired temperature range for effecting the desired pinhole reduction. Also, depicted in Fig. 5, is a blower unit 70 which in this embodiment can be a fan which will be operated to blow air passed the delaminating bar 50 for controlling the temperature thereof. The blower unit need not be used in conjunction with heater for effecting the desired temperature control although it is contemplated that such an arrangement is possible. Of course, appropriate temperature sensors, not shown, can be oppressively connected to the blower for controlling the latter.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
  • Laminated Bodies (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Abstract

L'invention concerne un procédé et un système pour commander la température d'une surface de séparation (54). On obtient ainsi une plage de température permettant de réduire la formation de piqûres dans une couche supportant une image, sur un support (16) d'image, lors de l'enlèvement d'un revêtement de protection stratifié de sa bande (11) de fixation au cours de l'opération de séparation du support et de la bande de fixation. Cela permet de réduire également la formation d'artefacts de stratification dans le support d'images.
PCT/US1996/002570 1995-03-14 1996-03-11 Systeme et procede de separation d'un support d'image contenant un stratifie WO1996028306A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE69614098T DE69614098D1 (de) 1995-03-14 1996-03-11 Verfahren und vorrichtung zum abziehen von laminatschichten, die ein bild tragendes medium enthalten
EP96910331A EP0814962B1 (fr) 1995-03-14 1996-03-11 Systeme et procede de separation d'un support d'image contenant un stratifie
JP8527634A JPH11502478A (ja) 1995-03-14 1996-03-11 有像媒体を含むラミネートを剥離する装置と方法
AU53556/96A AU708991B2 (en) 1995-03-14 1996-03-11 System and apparatus for delaminating a laminate containing image bearing media

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/403,342 1995-03-14
US08/403,342 US5785795A (en) 1995-03-14 1995-03-14 System and apparatus for delaminating a laminate containing image bearing media

Publications (1)

Publication Number Publication Date
WO1996028306A1 true WO1996028306A1 (fr) 1996-09-19

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Application Number Title Priority Date Filing Date
PCT/US1996/002570 WO1996028306A1 (fr) 1995-03-14 1996-03-11 Systeme et procede de separation d'un support d'image contenant un stratifie

Country Status (8)

Country Link
US (1) US5785795A (fr)
EP (1) EP0814962B1 (fr)
JP (1) JPH11502478A (fr)
KR (1) KR19980703018A (fr)
AU (1) AU708991B2 (fr)
CA (1) CA2214562A1 (fr)
DE (1) DE69614098D1 (fr)
WO (1) WO1996028306A1 (fr)

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EP0814962B1 (fr) 2001-07-25
US5785795A (en) 1998-07-28
EP0814962A1 (fr) 1998-01-07
AU708991B2 (en) 1999-08-19
JPH11502478A (ja) 1999-03-02
KR19980703018A (ko) 1998-09-05
AU5355696A (en) 1996-10-02
CA2214562A1 (fr) 1996-09-19

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